:root {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', sans-serif;
  color: #343d39;
  background: #f6f7f5;
  font-size: 13px;
  font-synthesis: none;
  --muted: #717b74;
  --line: #e4e8e3;
  --accent: #39715c;
  --text-size: 15px;
  --line-height: 1.9;
  --similar-color: #b6d4f0;
  --different-color: #f9dc84;
}
* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
body {
  margin: 0;
}
button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}
button,
a,
select,
input {
  touch-action: manipulation;
}
button {
  cursor: pointer;
  border: 1px solid #dce2dc;
  border-radius: 6px;
  background: #fff;
  padding: 7px 11px;
  line-height: 1.4;
}
button:hover {
  background: #edf2ed;
  border-color: #bbcdbf;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[role='button']:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
button:disabled {
  cursor: default;
  opacity: 0.45;
}
a {
  color: var(--accent);
  text-decoration: none;
}
select {
  min-width: 0;
  width: 100%;
  border: 1px solid #dce2dc;
  border-radius: 6px;
  background: #fff;
  padding: 9px 28px 9px 10px;
  text-overflow: ellipsis;
}
label {
  display: block;
  margin: 0 0 8px;
}
h1,
h2,
h3,
p {
  margin: 0;
}
h1,
h2,
h3 {
  font-size: 13px;
  font-weight: 600;
}
.top {
  height: 56px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: #fff;
  gap: 16px;
}
.brand {
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -0.65px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.brand span {
  background: #315f4e;
  color: #fff;
  padding: 2px 8px;
  border-radius: 6px;
  font:
    italic 21px Georgia,
    serif;
}
.brand small {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
  margin-left: 3px;
}
.top-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}
.privacy {
  color: var(--muted);
  font-size: 12px;
}
.settings-trigger {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 7px;
}
.settings-trigger svg { width: 20px; height: 20px; }
main {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  height: calc(100dvh - 56px);
  position: relative;
}
.sources {
  min-width: 0;
  padding: 24px 18px;
  background: #fafbf9;
  overflow: auto;
  border-right: 1px solid var(--line);
  scrollbar-width: thin;
}
.source-top > label {
  color: var(--muted);
  font-size: 12px;
}
.section-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  margin: 28px 0 14px;
}
.section-row h1 span {
  font-size: 11px;
  color: var(--muted);
  font-weight: 400;
  margin-left: 4px;
}
.section-row button {
  border: 0;
  padding: 4px;
  background: transparent;
  font-size: 12px;
  color: var(--muted);
}
.turn {
  display: block;
  border: 1px solid var(--line);
  padding: 13px;
  border-radius: 7px;
  margin: 0 0 14px;
  cursor: pointer;
  background: #fff;
}
.turn:has(input:checked) {
  border-color: #b1c9ba;
  background: #f3f7f2;
}
.turn:has(input:disabled) {
  opacity: 0.5;
}
.turn-heading {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #516a5b;
  font-size: 12px;
  font-weight: 550;
}
input[type='checkbox'] {
  accent-color: var(--accent);
  width: 13px;
  height: 13px;
  margin: 0;
  flex: 0 0 auto;
}
.turn p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.85;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.source-manage {
  width: 100%;
  border-style: dashed;
  background: transparent;
  color: var(--muted);
  margin-top: 5px;
}
.sample-note {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
  margin: 18px 2px 0;
}
summary {
  cursor: pointer;
}
.sample-note p {
  padding-top: 8px;
}
.workspace-canvas {
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}
.canvas-head {
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 24px;
  justify-content: space-between;
  padding: 14px 28px;
  background: #fff;
  flex-shrink: 0;
}
.artifact-picker {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}
.artifact-picker label {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
  white-space: nowrap;
}
.artifact-picker select {
  font-size: 14px;
  border: 0;
  font-weight: 550;
  background-color: transparent;
  max-width: 420px;
  padding-left: 0;
}
#toggle-details {
  color: var(--muted);
  border-color: transparent;
  background: transparent;
  flex-shrink: 0;
}
#toggle-details[aria-expanded='true'] {
  color: var(--accent);
  background: #f0f5ef;
}
.toolbar {
  padding: 0 28px;
  min-height: 44px;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: #fff;
  flex-shrink: 0;
}
.modes {
  display: flex;
  gap: 20px;
}
.modes button {
  font-size: 13px;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  padding: 12px 0 11px;
  color: var(--muted);
  white-space: nowrap;
}
.modes button[aria-pressed='true'] {
  color: #315f4e;
  border-bottom-color: #487e63;
}
.engine-status {
  background: transparent;
  border: 0;
  color: var(--muted);
  padding: 4px 0;
  font-size: 11px;
  text-align: right;
}
.reading-meta {
  padding: 11px 28px;
  min-height: 40px;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}
.summary {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 12px;
  flex-wrap: wrap;
}
.summary div {
  display: flex;
  align-items: baseline;
  gap: 5px;
}
.summary strong {
  font-size: 12px;
  font-weight: 550;
  font-variant-numeric: tabular-nums;
  color: #4b6356;
}
.filter {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}
.viewport {
  overflow: auto;
  flex: 1;
  min-height: 0;
  background-image: radial-gradient(#d9e0d7 0.6px, transparent 0.7px);
  background-size: 22px 22px;
  cursor: grab;
  scrollbar-width: thin;
}
.viewport.dragging {
  cursor: grabbing;
  user-select: none;
}
.board {
  padding: 12px 36px 48px;
  min-height: 100%;
  display: flex;
  justify-content: safe center;
  align-items: flex-start;
}
.paper {
  width: 100%;
  max-width: 840px;
  flex-shrink: 0;
  min-height: 520px;
  background: #fff;
  border: 1px solid #e1e6de;
  border-radius: 5px;
  box-shadow: 0 3px 18px #263c2b06;
  cursor: auto;
}
.paper-head {
  padding: 18px 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid #edf0eb;
  font-size: 12px;
  color: #788077;
}
.paper-head small {
  font-size: 10px;
  letter-spacing: 0.05em;
}
.output {
  padding: 32px 44px 64px;
  font-size: var(--text-size);
  line-height: var(--line-height);
  overflow-wrap: anywhere;
  color: #383f3a;
}
.output > :first-child {
  margin-top: 0;
}
.output p {
  margin: 0 0 1.15em;
  white-space: pre-line;
}
.output h1,
.output h2,
.output h3,
.output h4,
.output h5,
.output h6 {
  color: #303a32;
  font-family: inherit;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.015em;
  margin: 1.8em 0 0.65em;
}
.output h1 {
  font-size: 1.55em;
  margin-bottom: 0.85em;
}
.output h2 {
  font-size: 1.22em;
}
.output h3 {
  font-size: 1.1em;
}
.output h4,
.output h5,
.output h6 {
  font-size: 1em;
}
.output strong {
  font-weight: 600;
}
.output ul,
.output ol {
  padding-left: 1.5em;
  margin: 0 0 1.2em;
}
.output li {
  margin: 0.45em 0;
  white-space: pre-line;
}
.output blockquote {
  border-left: 2px solid #bdcbbd;
  padding-left: 18px;
  margin: 1.3em 0;
  color: #697167;
}
.output pre {
  font:
    12.5px/1.85 ui-monospace,
    SFMono-Regular,
    Menlo,
    Consolas,
    monospace;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  padding: 16px;
  border-radius: 5px;
  background: #f6f7f4;
  margin: 1.2em 0;
}
.output code {
  font:
    0.87em/1.6 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  background: #f0f2ee;
  border-radius: 3px;
  padding: 1px 3px;
}
.output hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.8em 0;
}
.table-wrap {
  overflow-x: auto;
  margin: 1.3em 0;
}
.output table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93em;
}
.output th,
.output td {
  border-bottom: 1px solid var(--line);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}
.output th {
  font-weight: 600;
  background: #f7f8f5;
}
.sentence {
  display: inline;
  border-radius: 2px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  color: inherit;
  padding: 1px 0;
  cursor: pointer;
  line-height: inherit;
}
.sentence:hover {
  box-shadow: 0 1px 0 #75997f;
}
.sentence.active {
  outline: 1px solid #5d8b70;
  outline-offset: 2px;
}
.diff-row {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
  font-size: 14px;
  line-height: 2;
  white-space: pre-wrap;
}
.diff-row small {
  display: block;
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 8px;
}
.diff-row del {
  background: #fae8e3;
  color: #945348;
}
.diff-row ins {
  background: #e1eee5;
  color: #3d6b50;
  text-decoration: none;
}
.canvas-footer {
  min-height: 44px;
  padding: 8px 24px;
  background: #fafbf8;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 22px;
  align-items: center;
  font-size: 11px;
  color: var(--muted);
  flex-shrink: 0;
}
#legend {
  display: flex;
  gap: 7px;
  align-items: center;
}
.gradient {
  width: 52px;
  height: 5px;
  background: linear-gradient(90deg, var(--different-color), var(--similar-color));
  border-radius: 6px;
}
.zoom {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.zoom button {
  padding: 3px 6px;
  border-color: transparent;
  background: transparent;
  font-size: 12px;
}
.zoom span {
  min-width: 33px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.details {
  width: 292px;
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: 10;
  padding: 24px;
  background: #fcfdfb;
  border-left: 1px solid var(--line);
  box-shadow: -8px 0 24px #1d3f2410;
  overflow-y: auto;
  scrollbar-width: thin;
}
.detail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 26px;
}
.detail-head button {
  border: 0;
  font-size: 20px;
  padding: 0 4px;
  background: transparent;
  color: var(--muted);
}
.detail-label {
  font-size: 11px;
  color: var(--muted);
}
.detail-score {
  font-size: 25px;
  font-weight: 550;
  letter-spacing: -0.03em;
  margin: 8px 0 16px;
  font-variant-numeric: tabular-nums;
}
.quote {
  border-left: 2px solid #a2bba8;
  background: #f1f5ef;
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.9;
  margin: 0 0 26px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.candidate {
  display: block;
  width: 100%;
  text-align: left;
  font-size: 12px;
  line-height: 1.85;
  border: 0;
  border-radius: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  margin: 0;
  padding: 16px 0;
}
.candidate strong {
  display: block;
  font-size: 11px;
  color: #65806c;
  font-weight: 500;
  margin-bottom: 8px;
}
.gaps-section {
  margin-top: 32px;
  font-size: 12px;
}
.gaps-section > summary {
  font-weight: 550;
  padding-bottom: 12px;
}
#gap-count {
  margin-left: 8px;
  font-weight: 400;
  color: var(--muted);
}
.gap {
  font-size: 12px;
  line-height: 1.85;
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.gap small {
  color: var(--muted);
  display: block;
  font-size: 10px;
  margin-bottom: 5px;
}
.empty {
  font-size: 13px;
  line-height: 1.9;
  color: var(--muted);
  padding: 24px 0;
}
dialog {
  width: min(600px, calc(100% - 32px));
  max-height: 88dvh;
  overflow: auto;
  border: 1px solid #d9e1d6;
  border-radius: 12px;
  padding: 28px;
  color: inherit;
  box-shadow: 0 24px 100px #1c33272b;
}
dialog::backdrop {
  background: #21372d38;
}
.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}
.dialog-head h2 {
  font-size: 18px;
  font-weight: 550;
}
.dialog-head button {
  border: 0;
  font-size: 22px;
  padding: 0 5px;
  background: transparent;
}
dialog p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}
.settings-tabs {
  display: flex;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}
.settings-tabs button {
  padding: 8px 0 12px;
  border: 0;
  border-radius: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--muted);
}
.settings-tabs button[aria-selected='true'] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.setting-row {
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.setting-row p,
.setting-block p {
  margin-top: 6px;
  font-size: 12px;
}
.setting-block {
  margin: 24px 0;
}
.color-settings { margin-top: 0; }
.color-presets { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 16px; }
.color-preset { position: relative; min-height: 72px; padding: 11px 12px; text-align: left; display: flex; flex-direction: column; justify-content: space-between; gap: 12px; border-color: #e0e6de; background: #fff; }
.color-preset:hover { background: #fafcf9; }
.color-preset[aria-pressed='true'] { border-color: #75a18b; background: #f6faf6; box-shadow: inset 0 0 0 1px #75a18b; }
.color-preset[aria-pressed='true']::after { content: '✓'; position: absolute; right: 12px; top: 9px; color: #39715c; font-size: 12px; }
.preset-name { font-weight: 550; }
.preset-swatches { display: flex; gap: 5px; }
.preset-swatches i { display: block; width: 40%; height: 12px; border: 1px solid #0000000a; border-radius: 4px; }
.custom-colors { margin-top: 18px; padding: 13px 0 0; border-top: 1px solid var(--line); }
.custom-colors summary { color: #436b57; font-size: 12px; font-weight: 550; }
.custom-colors summary span { color: var(--muted); font-weight: 400; }
.custom-colors > p { margin-top: 7px; font-size: 11px; }
.color-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.color-fields label { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 6px 10px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 7px; margin: 0; }
.color-fields input { width: 46px; height: 32px; padding: 2px; border: 1px solid var(--line); border-radius: 5px; background: #fff; cursor: pointer; }
.color-fields output { grid-column: 1 / -1; color: var(--muted); font: 11px ui-monospace, monospace; }
.color-preview { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 11px; margin-top: 15px; }
.color-preview b { flex: 1; height: 8px; border-radius: 5px; background: linear-gradient(90deg, var(--different-color), var(--similar-color)); }
@media (max-width: 480px) { .color-fields { grid-template-columns: 1fr; } }
.setting-block button,
.setting-actions {
  margin-top: 14px;
}
.setting-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.setting-actions button {
  margin: 0;
}
.threshold {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
}
.threshold input {
  width: 110px;
  accent-color: var(--accent);
}
.threshold output {
  width: 28px;
  font-variant-numeric: tabular-nums;
}
.setting-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}
.method-note {
  margin-top: 24px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.9;
}
.method-note p {
  margin-top: 8px;
  font-size: 12px;
}
textarea {
  width: 100%;
  border: 1px solid #d4ded2;
  background: #fafbf8;
  border-radius: 6px;
  padding: 12px;
  line-height: 1.8;
  resize: vertical;
  margin: 0 0 20px;
  font-size: 13px;
}
#install-prompt {
  font-size: 12px;
}
.primary {
  background: #38644f;
  color: #fff;
  width: 100%;
  padding: 10px;
}
.primary:hover {
  background: #2e5643;
  color: #fff;
}
.subtle {
  font-size: 12px;
  line-height: 1.85;
  color: var(--muted);
}
#status:not(:empty) {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 11px 18px;
  background: #354f40;
  color: #fff;
  border-radius: 7px;
  max-width: 90%;
  z-index: 100;
  font-size: 13px;
  box-shadow: 0 6px 24px #0002;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
@media (min-width: 1440px) {
  main:has(.details:not([hidden])) {
    grid-template-columns: 248px minmax(0, 1fr) 292px;
  }
  .details {
    position: static;
    width: auto;
    box-shadow: none;
  }
}
@media (max-width: 1000px) {
  main {
    grid-template-columns: 220px minmax(0, 1fr);
  }
  .sources {
    padding: 20px 14px;
  }
  .canvas-head,
  .toolbar {
    padding-left: 22px;
    padding-right: 22px;
  }
  .modes {
    gap: 16px;
  }
  .board {
    padding: 10px 22px 36px;
  }
  .output {
    padding: 28px 30px 48px;
  }
  .paper-head {
    padding: 16px 30px;
  }
  .reading-meta {
    padding-left: 22px;
    padding-right: 22px;
  }
  .summary {
    gap: 12px;
  }
  .summary div:nth-child(2),
  #counts {
    display: none;
  }
  .engine-status {
    max-width: 95px;
  }
}
@media (max-width: 700px) {
  .top {
    padding: 0 16px;
    height: 52px;
  }
  .brand small,
  .privacy {
    display: none;
  }
  main {
    display: flex;
    flex-direction: column;
    height: auto;
    min-height: calc(100dvh - 52px);
  }
  .sources {
    padding: 18px 16px 14px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .source-top {
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .source-top > label {
    margin: 0;
  }
  .source-top select {
    flex: 1;
  }
  .section-row {
    margin: 20px 0 10px;
  }
  #turns {
    display: flex;
    gap: 12px;
    overflow: auto;
    padding: 1px 0 4px;
  }
  .turn {
    width: 260px;
    min-width: 260px;
    margin: 0 0 8px;
  }
  .turn p {
    max-height: 118px;
    overflow: auto;
  }
  .source-manage {
    width: auto;
    font-size: 12px;
    padding: 6px 10px;
  }
  .sample-note {
    display: none;
  }
  .workspace-canvas {
    height: 820px;
    min-height: 80dvh;
  }
  .canvas-head {
    min-height: 62px;
    padding: 12px 16px;
    gap: 12px;
  }
  .artifact-picker {
    gap: 8px;
  }
  .artifact-picker select {
    max-width: 235px;
    font-size: 13px;
  }
  #toggle-details {
    font-size: 12px;
    padding: 6px 0;
  }
  .toolbar {
    padding: 0 16px;
    gap: 8px;
    flex-wrap: wrap;
  }
  .modes {
    gap: 18px;
    flex: 1;
  }
  .modes button {
    font-size: 12px;
  }
  .engine-status {
    display: none;
  }
  .reading-meta {
    padding: 10px 16px;
    gap: 8px;
  }
  .summary {
    font-size: 11px;
    gap: 10px;
  }
  .summary strong {
    font-size: 11px;
  }
  .filter {
    font-size: 11px;
  }
  .board {
    padding: 6px 12px 28px;
  }
  .paper-head {
    padding: 14px 22px;
    font-size: 11px;
  }
  .output {
    padding: 26px 22px 44px;
    font-size: 14px;
  }
  .canvas-footer {
    padding: 8px 16px;
    gap: 12px;
  }
  .details {
    position: fixed;
    top: 52px;
    width: min(320px, 90vw);
  }
  dialog {
    padding: 22px;
  }
  .setting-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .setting-grid {
    gap: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}

/* Comparison modes share sentence matching; these views expose distinct units. */
.diff-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
}
.diff-columns > div {
  min-width: 0;
  overflow-wrap: anywhere;
}
.word-unit {
  border-radius: 2px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.word-equal {
  background: var(--similar-color);
}
.word-insert {
  background: var(--different-color);
}
@media (max-width: 600px) {
  .diff-columns {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}